Getting prescription weight loss medication starts with a medical evaluation, either through your primary care doctor, a specialist, or a telehealth platform. You’ll need a BMI of 30 or higher, or a BMI of 27 or higher with at least one weight-related health condition like high blood pressure or type 2 diabetes. From there, your provider determines which medication fits your health profile, writes the prescription, and monitors you through a dose adjustment period that can last several months.
Who Qualifies for Weight Loss Medication
The eligibility threshold is straightforward. A BMI of 30 qualifies you on its own. A BMI of 27 qualifies you if you also have a weight-related condition such as high blood pressure, type 2 diabetes, high cholesterol, or sleep apnea. These cutoffs apply to all six FDA-approved long-term weight loss medications.
Your doctor will also screen for conditions that rule out specific drugs. If you have a history of seizures, certain medications are off the table. A personal or family history of a specific type of thyroid cancer called medullary thyroid cancer disqualifies you from the injectable GLP-1 drugs. Uncontrolled high blood pressure, glaucoma, or an overactive thyroid each eliminate particular options. This is why the evaluation matters: the right medication depends entirely on your medical history.
What Happens at Your First Appointment
Expect your provider to do more than check your weight. A thorough initial visit includes a full review of your symptoms, current medications, sleep quality, blood pressure, digestive health, and mental health history. Doctors look for underlying causes of weight gain, like thyroid disorders or medication side effects, before jumping to a prescription. Blood work is standard, and your provider may test for conditions like gastroparesis (slow stomach emptying) that would make certain drugs a poor fit.
This visit is also your chance to ask the right questions. Come prepared to discuss how your weight is affecting your health, whether any existing conditions might be contributing to weight gain, and what a realistic weight loss timeline looks like for you. Ask about side effects specific to the medication being considered and what the plan looks like if the first option doesn’t work.
Choosing the Right Provider
Your primary care doctor can prescribe weight loss medication, but obesity specialists, endocrinologists, and gastroenterologists typically have more experience managing these drugs long-term. The American Medical Association recommends finding someone who will provide consistent follow-up, not just write a one-time prescription. These medications require a titration period where your dose gradually increases, and that process needs medical oversight. Sometimes doses need to be reduced. Your provider should be tracking your symptoms, food intake, and activity level at each check-in.
Telehealth platforms have become a major access point. Services like Ro, Found, Calibrate, and Form Health offer online consultations where a licensed provider evaluates you, orders lab work, and prescribes medication that ships to your door. WeightWatchers now offers GLP-1 access for eligible members. These platforms typically pair prescriptions with coaching on nutrition, movement, and behavior change. If you go this route, verify that the platform uses licensed physicians (not just nurse practitioners in every state) and includes regular follow-up visits, not just an initial consultation.
The Medications Available Right Now
Six medications are FDA-approved for long-term weight management. They fall into two categories: oral pills and injectables.
Oral Medications
- Orlistat: Taken three times daily with meals. It works in your gut by blocking about a third of the fat you eat from being absorbed. Available in a lower-dose over-the-counter version (Alli) and a higher-dose prescription version.
- Phentermine-topiramate (Qsymia): A once-daily pill combining an appetite suppressant with an anti-seizure drug that also reduces hunger. One of the more effective oral options.
- Naltrexone-bupropion (Contrave): Combines a drug used for addiction treatment with an antidepressant. Targets the brain’s reward pathways and hunger signals. Taken once or twice daily.
Injectable Medications
- Liraglutide (Saxenda): A daily injection that mimics a gut hormone called GLP-1, which signals fullness to your brain and slows digestion.
- Semaglutide (Wegovy): A weekly injection using the same GLP-1 mechanism as liraglutide but with stronger results. One of the two most prescribed weight loss drugs currently.
- Tirzepatide (Zepbound): A weekly injection that activates two gut hormones (GLP-1 and GIP) instead of one. Clinical trials showed the highest average weight loss of any approved medication.
Phentermine on its own is also available for short-term use, typically a few weeks. It suppresses appetite but isn’t approved for ongoing treatment.
How These Drugs Actually Work
The injectable medications (Wegovy, Zepbound, Saxenda) work by mimicking hormones your gut naturally releases after eating. These hormones tell your brain you’re full, reduce cravings, and slow down how quickly food leaves your stomach. The result is that you feel satisfied with less food and think about eating less often. Tirzepatide activates two of these hormone pathways simultaneously, which appears to explain its edge in weight loss results.
The oral options work through different mechanisms. Orlistat blocks fat absorption in your digestive tract. Phentermine-topiramate suppresses appetite through the central nervous system. Naltrexone-bupropion targets the brain’s reward and hunger circuits. Your provider will match the mechanism to your specific situation, factoring in your other health conditions and medications.
What to Expect After Starting
You won’t start at a full dose. Every weight loss medication follows a titration schedule where you begin low and gradually increase over weeks or months. With Wegovy, for example, you move through progressively higher doses over about 16 to 20 weeks before reaching the maintenance dose. This gradual approach minimizes side effects, particularly nausea, which is the most common complaint with GLP-1 drugs.
Side effects vary by medication. The injectables commonly cause nausea, vomiting, diarrhea, or constipation, especially during dose increases. These symptoms typically improve as your body adjusts. Orlistat causes oily stools and gas if you eat high-fat meals. Your provider should be checking in regularly during this period, adjusting your dose if side effects are too disruptive, and making sure you’re eating enough. Eating too little is a real concern with the more powerful appetite-suppressing drugs.
Cost and Insurance Coverage
Cost is the biggest barrier for most people. Wegovy and Zepbound are now available directly from their manufacturers at $499 per month without insurance, with Zepbound’s starter dose priced at $349 per month. These prices represent significant reductions from the original list prices but remain substantial for a medication you may take indefinitely.
Private insurance coverage varies widely. Many plans now cover weight loss medications but require prior authorization, meaning your doctor must document that you meet specific criteria before the insurer approves payment. This often involves proving you’ve tried diet and exercise programs first, submitting BMI documentation, and confirming a weight-related health condition. Your provider’s office handles most of this paperwork, but expect the process to take days to weeks.
Medicare has historically not covered weight loss drugs, but that’s changing. Starting July 2026, a new program called the Medicare GLP-1 Bridge will provide eligible Medicare Part D beneficiaries with access to Wegovy, Zepbound (KwikPen formulation), and a newer drug called Foundayo for weight reduction. You’ll need to be enrolled in a standalone prescription drug plan or a Medicare Advantage plan with drug coverage, and prior authorization is required. This bridge program runs through December 2027, with a longer-term model planned after that.
Avoiding Compounded and Counterfeit Drugs
The popularity of GLP-1 drugs has created a market for compounded versions, which are custom-mixed copies made by specialized pharmacies. These products are not FDA-reviewed for safety, effectiveness, or quality. The FDA has issued multiple warnings about serious problems with compounded semaglutide and tirzepatide.
Some compounded injectables have arrived at patients’ doors without adequate refrigeration, which degrades the medication. Others have carried completely fraudulent labels listing pharmacies that don’t exist or didn’t actually make the product. The FDA has received reports of hospitalizations linked to dosing errors with compounded semaglutide, where patients or even healthcare professionals miscalculated doses. Some compounded products use different salt forms of semaglutide (like semaglutide sodium or semaglutide acetate) that may not behave the same way as the approved drug.
As of early 2026, both semaglutide and tirzepatide are off the FDA’s drug shortage list, meaning the supply of brand-name versions has stabilized. The legal basis for compounding these drugs narrows considerably when no shortage exists. If someone offers you compounded semaglutide or tirzepatide at a steep discount, treat that as a red flag. Two other compounds sometimes marketed for weight loss, retatrutide and cagrilintide, cannot legally be used in compounding at all.
Making the Process Go Smoothly
Before your appointment, gather your medical records, a list of every medication and supplement you take, and documentation of any previous weight loss attempts. Insurance companies and providers both want evidence that you’ve tried behavioral approaches. If you’ve worked with a dietitian, followed a structured program, or have records from a previous doctor noting weight-related conditions, bring all of it.
If your primary care doctor is reluctant to prescribe, ask for a referral to an obesity medicine specialist or an endocrinologist. You can also go directly to a telehealth platform, though you’ll want to confirm that the service is available in your state and that their prescribers are licensed where you live. Some platforms handle insurance billing, while others operate on a cash-pay model where you pay out of pocket and submit claims yourself.
Plan for the long term. These medications work best as part of a sustained approach that includes changes to eating, movement, and sleep habits. Most people regain weight if they stop the medication without maintaining lifestyle changes, which is why the best providers and telehealth programs build coaching and behavior support into the process from day one.